[Bugs] #1213 UNSP: let the logger do the formatting

[SugarLabs Bugs]

#1213: let the logger do the formatting
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    Reporter:  sascha_silbe               |          Owner:  erikos           
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-toolkit              |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  New              
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 With the attached patch we delegate the string formatting to the logger
 instead of doing it ourselves.
 See #1210 for an explanation.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1213>
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